|TAAL VOLCANO BULLETIN, 05 November 2011, 8:00 A.M.|
|Friday, 04 November 2011 23:55|
Taal Volcano’s (14.0000°N, 120.9833°E) seismic network did not detect any volcanic earthquakes during the past 24 hours. Field measurements on 01 November 2011 at the eastern sector of the Main Crater Lake yielded decreased water temperature of 33.3°C from 34.0°C, a slight water level drop to 1.30 meters from 1.38 meters and slightly more acidic pH of 2.76 from 2.81 as compared to previous readings. Ground deformation survey (precise leveling) on the Volcano Island last 21- 27 October 2011 indicated no significant change compared with July 2011, but is nonetheless still inflated compared with baseline data. Baselines calculated from continuous GPS (Global Positioning System) data for the period February to August 2011 also recorded a very slight but steady inflation of the northeast flank of the Volcano Island. Carbon dioxide (CO2) emission at the Main Crater Lake decreased to 482 tonnes per day on 18 October 2011 compared from the previous readings of 1,821 tonnes per day last 27 June 2011.
Alert Level 1 remains in effect over Taal Volcano. This means that hazardous eruption is not imminent. The public, however, is reminded that the Main Crater should be strictly off-limits because sudden steam explosions may occur and high concentrations of toxic gases may accumulate. The northern portion of the Main Crater rim, in the vicinity of Daang Kastila Trail, may also become hazardous when steam emission along existing fissures suddenly increases. Furthermore, the public is also reminded that the entire Volcano Island is a Permanent Danger Zone (PDZ), and permanent settlement in the island is strongly not recommended.